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The implementation of Gate Control Hybrid Doherty Amplifier  

Son Kil-young (Dept. of Electronic and Computer Engineering, Dankook University)
Lee Suk-hui (Dept. of Electronic and Computer Engineering, Dankook University)
Bang Sung-il (Dept. of Electronic and Computer Engineering, Dankook University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.42, no.3, 2005 , pp. 1-8 More about this Journal
Abstract
In this paper, design and implement 60W Doherty power amplifiers for 3GPP repeater and base station transceiver system. Efficiency improvement and high power property of Doherty power amplifier is distinguishable; however implementation of assistance amplifer is difficult, though. To solve the problem, therefore, GCHD (Gate Control Hybrid Doherty) power amplifier is embodied to gate bias adjusament circuit of assistance amplifier to General Doherty power amplifier. Experiment result shows that $2.11\~2.17GHz$, 3GPP operating frequency band, with 62.55 dB gain, PEP output is 50,76 dBm, W-CDMA average power is 47.81 dBm, and -40.05 dBc ACLR characteristic in 5MHz offset frequency band. Each of the parameter satisfied amplifier specification which we want to design. Especially, GCHD power amplifier shows proper efficiency performance improvement in uniformity ACLR than general power amplifier.
Keywords
Doherty amplifier; Efficiency enhancement; Bias control;
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